【摘要】 低含量百菌清原药先经热水洗涤除去酸性物质和大部分的间苯二腈， 干燥后再用甲苯进行重结晶， 可获外观灰白色的百菌清原药。其百菌清含量≥９５ ％ 、间苯二腈含量≤０１ ％ 、收率≥６６ ％ 、甲苯回收率≥８６ ％ 。更多还原

【Abstract】 A method for purification of poor chlorothalonil has been developed, that is washed by hot water to remove acidic compounds and the greater part of m phthalic nitrile, and then dried and recrystallized. The gray white poduct can be obtained with contents of chlorothalonil more than 95% and m phthalic nitrile less than 0.1%. The recoveries of m phthalic nitrile and toluol were more than 66% and 86%, respectively.更多还原